Sight-testing apparatus.



No. 726,101. PATBNTED APR, 21, 1903. P. W. REICH & M. B, GLASON.

SIGHT TESTING APPARATUS.

APPLICATION FILED ABR. l1, 1901.

N0 MODEL.

KLDMH VEN T ORS Allorney UNITED STATEs PATENT OFFICE.

FREDERICK ltllIUlI ANI) MIL() li. CLSON, OF COLUMII'S, GEORGIA.

SIG HT-TESTING APPARATUS.

SPECIFICATION forming partof Letters Patent No. 72 6,101, dated April 2i, 1903.

Application tiled April 11,`1901.A Serial No. 55.408. (No model.)

To all, 1li/tom, it '1n/n.7] concern: p

Be it known that we, FREDERICK \V. REICH and MILo l. CLAsoN, residents of Columbus, inthe county of Muscogce and State of' Georgia,have invented certain newand useful Improvements in Sight-Testing Apparatus; and we do hereby declare the following to be a full, clear, and exact description 'of the irlvention, such as will enable others skilled` in the art to which it appertainf-iI to make and use the same.

Our invention relates to an improvement in sight-testing apparatus, the object of the invention being to provide an improved apparatus of this character which can be operated from a distance to expose to view any of a series of characters to the exclusion of the others to test the sight of the patient.

W'th this object in View the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out in the claim. In the accompanying drawings, Figure l is a front view showing the casing in dotted lines, illustrating ourimprovements. Fig. 2 is an end view of the same. Fig. 3 .is a front view of a modified form of our invention, and Fig. 4 is a view of the curtain removed.J

1 represents a cabinet comprising`a board or block 2, to be secured to the Wall or other support, and a curved plate 3 is secured to the board 2 and bulged outward therefrom, as shown. To the board 2 flanged parallel plates 4 are secured by screws 4 and project at right angles thereto and are provided near ltheir upper ends with alined bearings for trunnions on the ends of .a roller 5 and near their lower ends with angular openings to securely hold against rotation the angular ends'ot` a shaft G, on which latter a hollow roller 7 is mounted and provided at its ends with plates 8 to center the roller7 on its shaft. A

flanges l() to guide a curtain ll, which latter is secured at one end to roller 5 and at its other end 1.o roller 7, the slack in said curtain being Wound on the rollers and the curtain held taut and smooth between the rollers by the tension of springt). A pulley or drum l2 is secured on one cud of roller 5 and has secured thereto and wound thereon a cord or chain i3, which latter projects through the cabinet and is adapted to be grasped by the operator to move the curtain to expose any of a series of characters thereon, as will be nlore fully hereinafter described. 'lhe front of the cabinet is made withan opening to expose a portion of the curtain and with a cylindrical flange 14 all around the opening to bear against the curtain and prevent any rays of light from the interior of the cabinet escaping between the liange and curtain. Electric incandescent lights l5 are mounted in the cabinet behind the curtain, or they may, if desiredpbe located outside of the casing, as shown in- Fig. 3. Part of the curtain is made opaque and has openings cut therein to permit the bright light to shine through, forming a bright area, and test the muscles of the eye. Other openings having colored translucent material therein,as shown at 1G, are provided for color tests, and part 8o of the curtain is made transl ucent,and opaque letters, characters, dac., are depicted thereon, so as to be made visible by the interior illumination.

The operation of our improvements is as follows: The operator grasps the free end of cord or chain 13 and revolves roller 5, thus Winding the curtain thereon and unwinding it from roller 7 to expose that portion of the curtain desired to the patient. he unwinding of the curtain from roller 7 contracts spring 9, so that when the tension on cord l 3 is released the spring will return the curtain to its former position or tp expose other characters on the curtain.

Various slight changes might be resorted toin the general form and agrangeinent of the several parts described without departing; from the spirit and scope of our inventonp and hence. we would have it'nnderstood that roo we do not wish to limit ourselves to the precise details set forth, but consider ourselves :it iiberty to makesueh slight changes andy ered translucent material over some of said holes, means for illuminating the portion of the curtain which appears through the opening in the casing, and means for moving the curtain to expose the various portions thereof for the purposes herein set forth.

In testimony whereof wehave signed this specification in the presence of two subscribing witnesses.

- FREDERICK W. REICH.

MlLo B. oLAsoN. Witnesses:

H. C. FLINN, D. E MooREFIELn 

